JPS5887534A - Color electronic shutter - Google Patents

Abstract

PURPOSE:To obtain a color picture having good resolution, by providing a tri- color filter and an electronic shutter in front of a black-and-white cathode-ray tube. CONSTITUTION:On a fluorescent surface 1a of a black-and-white cathode-ray tube 1, one scanning line is drawn by a red component in a color television picture signal. At the same time, when voltage is applied to a red color electrode group among 3 electrode goups of a PLZT element 11, the polarizing surface is rotated as to only its part. As a result, by polarizing plates 10a, 10b, as for only its part, light of the cathode-ray tube passes through the red part of a filter 4, and as for other part, it does not pass through. In the same way, when scanning and driving of the electrode group are executed synchronously to blue and green colors, too, an observer 6 is able to see a color picture through a window 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color electronic shutter suitable for use in, for example, a color video reproduction device.

In general, proposed color video reproducing devices include a shadow mask type color video reproducing device using a shadow mask type color cathode ray tube, and a beam index type color video reproducing device using a beam index type color cathode ray tube.

In a shadow mask type color video reproduction device that uses a shadow mask type color cathode ray tube, three electron beams density-modulated with three primary color signals of red, green, and blue are placed on a fluorescent surface, respectively. Corresponding colored phosphors among the phosphors must be hit correctly to avoid color shift.

Therefore, a circuit for this purpose, such as a convergence circuit, is required, which makes the circuit configuration complicated and its adjustment difficult.

On the other hand, a beam index type color image reproducing device has a single electron beam as a picture tube, and has a fluorescent surface with red, green, and blue color phosphor stripes arranged in sequence in the horizontal direction. An index phosphor stripe arranged horizontally on the inner surface of the optical surface is used, and the color is switched based on the signal obtained by scanning the index phosphor stripe with an electron beam. The red primary color signal is used when the beam scans the red color phosphor stripe, the green primary color signal is used when the beam scans the green color phosphor stripe, and the green primary color signal is used when the beam scans the blue color phosphor stripe. The density is modulated using the blue primary color signal. Therefore, due to variations in the interval between index phosphor stripes, time delays in detection signals, etc., it is difficult for the electron beam density-modulated with each primary color signal to accurately hit the corresponding color phosphor stripe. It is extremely difficult to do so. This requires an additional circuit for performing the correction, resulting in a disadvantage that the circuit configuration becomes complicated.

Further, in both of these shadow mask type and beam index type color image reproduction devices, the fineness of the color phosphor arranged on the phosphor surface is limited.

Therefore, especially when miniaturized, the pixels are coarse and the resolution is severely degraded, which is a drawback.

The present invention aims to propose a color electronic shutter suitable for use in constructing a color video reproducing apparatus that eliminates such drawbacks.

Hereinafter, an example in which the color electronic shutter according to the present invention is used in a color video reproduction device will be described with reference to the drawings.

FIG. 1 shows an entire color video reproducing apparatus using a color electronic shutter according to the present invention. This color video reproducing apparatus includes a monochrome cathode ray tube (1) to which red, green, and blue primary color signals ER, EG, and EB are sequentially switched and supplied at a predetermined period, for example, every horizontal period; A lens (2) for magnifying the image obtained on the fluorescent surface (1a) and a peephole (3) are arranged near the red,
a color filter (4) having at least one set of primary color filters FR, FG and FB of red, green and blue that respectively pass green and blue light; The image light from the image obtained on the fluorescent surface (1a) corresponding to the primary color signals ER, EG, and EB passes through the red, green, and blue primary color filters FR, FG constituting the color filter (4), respectively. and an electronic shutter (5) which passes through the FB section.

In this case, the color filter (4) and the electronic shutter (5)
A color electronic shutter is configured.

As shown in the principle diagram of FIG. 2, the color video reproducing apparatus shown in FIG.
When the image obtained above is generated by an electron beam density-modulated by the red primary color signal ER, the image light from the image line passes through the lens (2) as shown in Figure 2A. After being refracted, the light passes through the red primary color filter FR of the color filters (4) and is supplied to the viewer (6). Therefore, the observer (6) sees a virtual red image S magnified by the lens (2) at a predetermined position l behind the fluorescent surface (1a).
You can see R. Similarly, when the black-and-white image obtained on the fluorescent surface (1a) of the black-and-white cathode ray tube (1) is generated by an electron beam density-modulated by green and blue primary color signals EG and EB, As shown in Figures 2B and C, the observer (6) sees the virtual green and blue images S magnified by the lens (2) at a predetermined position l behind the fluorescent surface (1a).
G and SB can be seen. Thus, the black and white cathode ray tube (1) receives red, green and blue primary color signals E every horizontal period.
Since R, EG and EB are switched and supplied, the observer (6)
will see the red, green and blue images SR, SG and SB sequentially every horizontal period at a predetermined position l, and therefore the observer (
6) can only view the color image SC enlarged at this predetermined position l.

Red, green, and blue primary color signals ER, EG, and EB are sequentially switched and supplied to the monochrome cathode ray tube (1) every horizontal period (1H). That is, from the color video signal SV, the signal processing circuit (7
) are supplied to gate circuits (8R), (8G) and (8B), respectively.

And these gate circuits (8R) (8G) and (8B
) are supplied with pulse signals PR, PG and PB as gate signals as shown in FIG. 3C, E and F, respectively.

During the period in which these pulse signals PR, PG and PB are at high level "1", the primary color signals ER, EG and E are used.
B is extracted one after another.

And this gate circuit (8R) (8G) and (8B)
The primary color signals extracted at are sequentially supplied to a monochrome cathode ray tube (1).

Pulse signals PR, P as shown in FIG. 3 C, E and F
G and PB are formed by a ring counter (9), for example. That is, as shown in FIG. 4, this ring counter (9) is composed of three JK flip-flops (9R), (9G), and (9B). A horizontal synchronizing signal PH as shown in FIG. 3B is supplied as a trigger signal to the trigger terminals TR, TG and TB of these flip-flops (9R), (9G) and (9B), (9R) (9G) and (9B
), the set input terminal SR, reset input terminal RG, and reset input terminal RB are connected to the
A frame signal PF of Hz is supplied. Therefore, these three flip-flops (9R) (9G) and (9
When the frame signal PF is supplied to the output terminals QR, QG, and QB of B), signals of 1, 0, and 0 appear, and thereafter, each time the horizontal synchronization signal PH is supplied, signals of 1, 0, and 0 appear in sequence. 1" and 0" → 0", 0" and 1" → 1",
Signals that change as 0'' and 0''→... are obtained. That is, pulse signals PR, PG, and PB as shown in FIG.
G) and (8B) as a gate signal.

In addition, the lens (2) is located in front of the fluorescent surface (1a) (observer (6)
) side). In this case, the focal point is this fluorescent surface (
1a), so that the observer (6) can use this lens (2) to see an enlarged image obtained on this fluorescent surface (1a). There is. In other words, this lens (2) is designed to act as a so-called "magnifying glass lens" for the image obtained on the fluorescent surface (1a).

This lens (2) is the front part (17A) of the cylindrical outer part (17).
It is held inside by a holding mechanism (21).

Furthermore, the color filter (4) and the electronic shutter (5) constituting the color electronic shutter are arranged as shown in an enlarged view in FIG.
) side) near the peephole (3). This color filter (4) and electronic shutter (5) are also outside (17)
It is held in the front part (17A) by a holding mechanism (21).

First, the color filter (4) is, specifically, as shown in FIG. 6, striped primary color filters FR, FG, and FH each having a width l1 of red, green, and blue, for example, 0.33 mm, are sequentially arranged. It is configured. In this case, the red primary color filter FR allows red light to pass, the green primary color filter FG allows green light to pass, and the blue primary color filter FB allows blue light to pass. In principle, only one set of these primary color filters FR and FB may be used, but in order to reduce color shading on the image plane, they are configured in multiple sets, and in this example, as shown in FIG. 6, they are configured in four sets. ing. Also, the seventh
As shown in the figure, a cover glass (4a) is attached to one side of this color filter (4).

The electronic shutter (5) also has a polarizer (5) consisting of linear polarizing plates arranged on both sides of the above-mentioned color filter (4), whose polarization planes are different from each other by π/4 as shown in FIG. 10a) and analyzer (10b), and an electro-optical element, in this example PLZ, is attached to the cover glass (4a) side (polarizer axis) of the color filter (4), as shown in FIG.
It is composed of a polarization plane control device (11) made of T(SrBaNb306) (11a).

This polarization plane control device (11) has a linear control electrode (11H) made of, for example, an alloy of nickel (Ni) and chromium (Cr) plated with gold (Au) on the surface of PLZT (11a). 11L) (11R) (11B) and (1
1B) is (11L) → (11R) → (11B) → (1
1H) → (11R) → (11B) → (11L)...
. . . are arranged at intervals of l1. In this case, control electrodes (11H) (11L
) (11R) (11R) (11B) and (11B) are each primary color filter FR constituting the above-mentioned color filter (4).
, FG, and FB have a positional relationship as shown in FIG. That is, the control electrode (11H)
and (11L) are located at one end and the other end of a set of primary color filters FR, FG, and FB. Also,
The control electrodes (11R) and (11R) are located at the boundaries of the primary color filters FR and FG, respectively, and the control electrodes (11B) and (11B) are located at the boundaries of the primary color filters FG, respectively.
and FB. Here, these control electrodes (11H) (11L) (11R) (11R)
(11B) and (11B) may be provided only on one side of PLZT (11a), but in this example, the ninth
As shown in the figure, they are arranged in exactly the same manner on the other side.

The control electrode (11L) is grounded via a protective resistor and has a potential of OV. In addition, control electrode (11H) (1
1R) (11R) (11B) and (11B) are connected to control voltage supply terminals (12H) (12B) through protective resistors, respectively.
R) (12R) (12B) and (12B). Then, a positive DC voltage +B, for example, 300V, is applied to the terminal (12H), and the terminal (12R) (12R) (12B
) and (12B) are provided with control voltages VR, VR, VB as shown in FIG.
, and VB are respectively supplied from a control voltage supply circuit (13).

This control voltage supply circuit (13) is constructed as shown in FIG. In the figure, (13a) indicates a power supply terminal to which positive DC voltage +B (for example, 300V) is supplied. As this DC voltage +B, for example, as shown in FIG.
The voltage obtained by boosting and rectifying the voltage at the C-DC converter (15) is supplied. In addition, the connection switch (14)
will be described later, but it is normally in a connected state, and the lens mentioned above (
2) The disconnected state occurs only when the color filter (4), electronic shutter (5), etc. are removed so that the observer (6) can directly view the fluorescent surface (1a) of the monochrome cathode ray tube (1). It is made so that.

Now, in FIG. 11, the npn type transistor Tr1
, Tr4, Tr7 and Tr10 have terminals (1
3b) via (13c) (13d) and (13e),
Figure 3 C and D obtained with the ring counter (9) described above
, F and G are supplied with pulse signals PR, PR, PB and PB. Incidentally, the pulse signals PR and PB are sent to the flip-flop (9R) constituting the ring counter (9).
) and (9B) are obtained at the inverted output terminals QR and QB. Here, the transistor Tr1 is turned on during the period when the pulse signal PR supplied to its base is at a high level "1", that is, the period when the red primary color signal BR is supplied to the black and white cathode ray tube (1), and other than that, the transistor Tr1 is on. period is off. Therefore, pnp type transistor Tr2 and npn
At the connection point of the emitters of the type transistor Tr3,
During the period when the red primary color signal ER is supplied to this monochrome cathode ray tube (1), the control voltage VR is 0V, and the voltage is +B during the other periods, as shown in FIG. It is supplied to the control voltage supply terminal (12R). Also n
The pn-type transistor Tr4 is turned on during the period when the pulse signal PR supplied to its base is at a high level 1'', that is, when the red primary color signal ER is not supplied to the monochrome cathode ray tube (1), and is turned on during the other periods. is off, so p
np type transistor Tr5 and npn type transistor T
At the connection point of the emitters of r6, a control voltage as shown in Fig. 3 is applied, which is +B voltage during the period when the red primary color signal is supplied to the monochrome cathode ray tube (1) and 0V during the other periods. VR is obtained and is thus supplied to the control voltage supply terminal (12R). Further, the npn transistor Tr7 is turned on during the period when the pulse signal PB supplied to its base is at a high level "1", that is, during the period when the blue primary color signal EB is supplied to the monochrome cathode ray tube (1). It is off during other periods. Therefore, the connection point between the emitters of the pnp transistor Tr8 and the npn transistor Tr9 has a voltage of 0V during the period when the blue primary color signal EB is supplied to the monochrome cathode ray tube (1), and a voltage of +B during the other periods. A control voltage VB as shown in FIG. 3J is obtained. Thus, this is the control voltage supply terminal (12B
). In addition, the npn type transistor Tr10
is on during the period when the pulse signal PB supplied to its base is at a high level "1", that is, when the blue primary color signal EB is not supplied to the monochrome cathode ray tube (1), and is off during other periods. be. Therefore, pnp type transistor T
At the connection point of the emitters of r11 and npn transistor Tr12, a voltage of +B is applied during the period when the blue primary color signal EB is supplied to the monochrome cathode ray tube (1), and 0V at other times, as shown in FIG. 3K. A control voltage VB as shown is obtained. Presumably, this is supplied to the control voltage supply circuit (12B). Furthermore, the positive DC voltage +B supplied to the power supply terminal (13a) is supplied to the control voltage supply terminal (12H).

In the end, the control electrode (11
L) (11R) (11B) (11H) (11R) (11
B) and (11L)K are shown in Figure 13 D, E, F, G, respectively.
, H, I and J as shown in voltages V11L, V11R, V
11B, V11H, V11R, V11B and V11L will be applied.

By the way, as shown in FIG.
Electrodes (16a) and (16b) are placed on the surface of LZT (11a).
) is deposited and a potential difference V is applied between these electrodes (16a) and (16b), the refractive index changes due to the Kerr effect, Pockels effect, etc. At this time, linearly polarized light with a polarization plane in the x direction is The light L1 is transmitted to this electro-optical element (11a
), it is known that the plane of polarization is rotated by π/4, resulting in light L2 having a plane of polarization in the y direction that is shifted by π/4 from the x direction. Electronic shutter of this example (5)
takes advantage of this fact.

That is, the electronic shutter (5) of this example is a polarizer (10a).
Of the light linearly polarized so as to have a polarization plane in the x direction at The surface is rotated by π/4 so that it has a polarization plane in the y direction, and thus only the light that passes through this predetermined position is obtained from the analyzer (10b), which exhibits a shutter effect. be.

The color filter (4) and electronic shutter (5) that make up the color electronic shutter are configured as described above, and during the period when the pulse signal PR is at a high level 1'', that is, when the black and white cathode tube (1) is exposed to the red primary color. During the period when the signal ER is supplied, the control electrodes (11L) (11R) (11B) (11
H) (11R) (11B) and (11L) include the 13th
As shown in the figure, 0V, +B, +B, +B and 0V, respectively.
0V and 0V are applied. Therefore, during this period, between the control electrodes (11L) and (11R) and between (11H) and (11R).
), and the above-mentioned change in refractive index occurs only in this region of PLZT (11a). Between the control electrodes (11L) and (11R) and (11H) and (
11R) is the red primary color filter F of color filter (4).
It corresponds to R.

Therefore, among the color filters (4), only the polarization plane of the red light passing through the red primary color filter FR is rotated by π/4, and from the above explanation, during this period, the polarizer (10a ), only the red light that passes through the red primary color filter FR is obtained from the analyzer (10b).

Furthermore, during the period when the pulse signal PG is at the high level 1'', that is, during the period when the green primary color signal EG is supplied to the monochrome cathode ray tube (1), the control electrodes (11L) (11R) (1
1B) (11H) (11B) (11R) and (11L)
are OV, OV, +B, +, respectively, as shown in Figure 13.
B, +B, OV and OV are applied. Therefore, a potential difference is generated between the control electrodes (11R) and (11B) and between (11R) and (11B) during this period, and the above-mentioned change in refractive index occurs only during this period of the PLZT (11a).

Between this control electrode (11R) and (11B) and (11R)
and (11B) corresponds to the green primary color filter FG of the color filter (4). Therefore, color filter (4)
Of these, only the polarization plane of the green light passing through the green primary color filter FG is rotated by π/4, and during this period, the polarizer (10a) rotates the polarization plane in the x direction. Green primary color filter F of linearly polarized light
Only the green light passing through the G section will be obtained from the analyzer (10b).

Furthermore, during the period when the pulse signal PB is at a high level "1", that is, during the period when the blue primary color signal EB is supplied to the monochrome cathode ray tube (1), the control electrodes (11L) (11R) (
11B) (11H) (11B) (11R) and (11L
) are 0V, 0V, +B, respectively, as shown in Figure 13.
+B, +B and 0V are applied. Therefore, during this period, between the control electrodes (11B) and (11H)
1L), and the above-mentioned change in refractive index occurs only in this region of PLZT (11a). The area between the control electrodes (11B) and (11H) and between (11B) and (11L) correspond to the blue primary color filter FB of the color filter (4). Therefore, among the color filters (4), only the polarization plane of the blue light passing through the blue primary color filter FB is rotated by π/4, and during this period, the polarizer (10a) is rotated in the x direction. Of the light linearly polarized to have a plane of polarization, only the blue light that passes through the blue primary color filter FB is obtained from the analyzer (10b).

From the above, in the color video reproducing apparatus shown in Fig. 1, red, green, and blue primary color signals E
When R, EG and EB are supplied, their fluorescent surfaces (1a
) The image light from the image obtained above is refracted by each lens (2), and then passed through the red, green, and blue primary color filters FR, FG, and FB among the color filters (4), respectively. The observer (6) looking through the hole (3) is supplied with only red, green and blue light. Therefore, the observer (6) can see the enlarged red, green, and blue images SR, SG, and SB at a predetermined position l behind the fluorescent surface (1a), as shown in the principle diagram of FIG. The monochrome cathode ray tube (1) receives red, green, and blue primary color signals ER, EO, and EB every horizontal period.
Since the images are switched and supplied, the observer (6) can see the color image SC at this predetermined position l.

Furthermore, in the color video reproducing apparatus shown in FIG. 1, a lens (2), a color filter (4) and an electronic shutter (5)
) is held, and the front part (17A) of the foreign body (17) is moved so that the observer (6) can look directly onto the fluorescent surface (1a). That is, in FIG. 1, (160
) indicates a flip-up hinge, and this hinge (160) connects the front part (17A) of the foreign body (17) and the rear part, that is, the part (17B) fixed to the black and white cathode ray tube (1). There is. In this case, the front portion (17A) is movable about the hinge (160) as shown by the arrow in the figure. At that time, the observer (6) looks directly onto the fluorescent surface (1a) of the monochrome cathode ray tube (1).

In Figure 1, (18) is this foreign country (17)
This is a changeover switch that is switched in relation to the movement of the front part (17A) of the foreign vehicle, and is fixedly installed in the rear part (17B) of the foreign vehicle. The movable contact (1) of this changeover switch (18)
8a) is grounded, one fixed contact (18b) is electrically floating, and the other fixed contact (18b) is grounded.
c) is connected to a control signal supply terminal of a connection switch (20) that controls the operation of the connection switch (14) and color killer circuit (19) described above. In this case, foreign countries (17
), the button (18d) of the switch (18) is pressed by the protrusion (18e) fixed to the front part (17A). This switch (18) has a movable contact (18a) connected to one fixed contact (18b), and is connected to a foreign country (18).
When the front part (17A) of the switch (17) is moved, the button (18d) of the switch (18) is opened, and the movable contact (18a) of the switch (18) is connected to the other fixed contact as shown by the broken line. (18c).

Therefore, moving the foreign anterior (17A) and observing the observer (
6) when looking directly onto the fluorescent surface (1a) of the monochrome cathode ray tube (1), the second fixed contact (18c) of the switch (18)
will be grounded, and at this time the connection switch (14
) and (20), the ground potential is supplied to the control signal supply terminals.

The connection switch (14) is normally in a connected state, but is configured to be in a disconnected state only when a ground potential is supplied to its control signal supply terminal. Therefore, at this time, the horizontal synchronizing signal PH is input to the DC-DC converter (15).
is no longer supplied, so the control voltage generation circuit (13
) is no longer supplied with the DC voltage +B, and thus, at this time, the control voltage generation circuit (13) stops supplying the control voltage to the polarization plane control device (11) that constitutes the above-mentioned electronic shutter (5). will be done.

Further, the connection switch (20) is normally in a disconnected state, but it is configured to be in a connected state when a ground potential is supplied to its control signal supply terminal, and at this time, the color killer circuit (19) At this time, a luminance signal is obtained from the well-known retrospective signal processing circuit (7) in place of the red, edge and blue primary color signals ER, EO and EB.

Eventually, at this time, a luminance signal is supplied to the black and white cathode ray tube (1), and a black and white image is generated on its fluorescent surface (1a) by the electron beam density-modulated by this luminance signal, and the viewer (6) ) can directly view this black and white image.

In this case, the color filter (4) and the electronic shutter (5)
Of course, by moving only the lens (2) and leaving the lens (2), the observer (6) can enlarge and view the black and white image using the lens (2).

Further, in this example, the power supply to the electronic shutter (5) is stopped using the changeover switch (18), but there are other power supplies (not shown) that are also turned off that are not needed. It is also possible to do so.

In FIG. 1, (22) is an eyecup large enough to accommodate, for example, "Tombow Glasses".

As is clear from the embodiments described above, according to the color electronic shutter according to the present invention, when a predetermined voltage is supplied to each of the linear electrodes arranged on the electro-optical element, each primary color light of the color filter is It is possible to sequentially open the linear electrodes corresponding to the passage planes. Therefore, for example, as described above, the respective voltages supplied to the linear electrodes can be conveniently used in a color video reproduction device as being related to the red, green and blue primary color signals supplied to a monochrome cathode ray tube. can.

In the above-described embodiment, the color filter (4) has a horizontal stripe shape, but is not limited to this, and may have a vertical stripe shape, or may have a concentric shape. It's okay. Of course, the arrangement of the control electrodes arranged on the PLZT (11a) forming the polarization plane control device (11) constituting the electronic shutter (5) will of course be changed accordingly.

Furthermore, in the above embodiment, the polarization plane control device (11) was formed using PLZT (11a);
Other electro-optical elements such as KDP and DKDP can also be used instead of PLZT (11a).

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an example of a color video reproducing device using a color electronic shutter according to the present invention, Fig. 2 is a line diagram explaining the principle of the example shown in Fig. 1, and Fig. 3 is an example shown in Fig. 1. 4 is a diagram showing the configuration of a specific example of a ring counter. FIG. Figure 6 is a front view showing a specific example of a color filter;
7 is a sectional view taken along the line AA' in FIG. 6, FIG. 8 is a front view showing an example of the polarization plane control device, and FIG. 9 is a sectional view taken along the line BB' in FIG.
10 is a line diagram showing the positional relationship between the color filter shown in FIG. 6 and the polarization plane control device shown in FIG. 8, and FIG. 11 is a configuration diagram showing a specific example of the control voltage supply circuit. , 1st
FIG. 2 is a diagram for explaining the properties of the electro-optical element (PLZT), and FIG. 13 is a diagram for explaining the example in FIG. (1) is a black and white cathode ray tube, (2) is a lens, (4) and (
5) are a color filter and an electronic shutter, respectively, constituting the color electronic shutter according to the present invention. Figure 31 1 Figure 6 Figure 7 ``--Ha = 249- Figure 10 Figure 11 @ 12 Figure 13 Procedural amendment January 7, 1981 1. Indication of the case 1988 Patent application no. 186683 No. 2, Name of the invention 81 children, - 3, Person making the amendment Relation to the patent applicant's fee, 1; Number of inventions 7, Detailed description of the invention in the specification subject to amendment and drawings. 8. Contents of amendment (1) In the specification, negative line 12 of the 9th line, line 10 of the 15th member, 11
line, line 19, page 16, line 18, page 17, line 16 and -j
Correct each If-zJK that says "1" in line j14 (2) Correct the trace of the attached sheet in figure 83 in the drawing. that's all

Claims (1)

[Claims] Electro-optical elements are disposed adjacent to color filters having first, second, and third primary color light passing surfaces, and a line is formed between one end and the other end of the color filters and the primary color light passing surfaces. first and second voltages are supplied to two linear electrodes arranged at both ends of the color filter, and two lines arranged at the border of the primary color light passing surface of the color filter. The first or second voltage is supplied to the linear electrodes at predetermined intervals, and the portions between the linear electrodes corresponding to the passing surfaces of the respective primary color lights of the color filter are sequentially opened. and color electronic shutter.